Yeshivish Sartorialism

I was at a kiddush this past Shabbat for an aufruf. The boy is rather yeshivish and a number of his friends were there. I noticed that all the boys, from the chatan to his younger brother, to his friends, to a number of other single men there, all wore their shirt collars open with a tie (many of them in garish neon colors) bearing an over sized Windsor Knot and ending well above the waist band (where a tie ought to end). what’s up with this? Has the Borsalino style hat become too ubiquitous to serve as an identifier of yeshiva leit? Is this the new tell of a yeshivish man? Can anyone explain why dressing poorly is so popular?